Arrangement and method of planning and testing a RTI system

Abstract: In a mobile system for short-range communication, mobile units or vehicles are moving within the coverage area (1) of the system. Beacons (VB, RB) are arranged to communicate with the mobile units for obtaining and delivering information respectively to the mobile units for determining traffic situations, road situations and so forth in the coverage area. As beacons, virtual beacons (VB) are included which are in connection with at least one higher-level unit (NBLT). In the last-mentioned unit, the virtual beacons are represented in tables, preferably through information on access telephone numbers and positions of the virtual beacons in the system.

Description: TECHNICAL FIELD The present invention relates to an arrangement devised for nerwork planning and configuration testing for an RTI system, which system is devised to provide short-range communication where mobile units or vehicles move within the coverage area of the system and where beacons (radio beacons) are arranged to communicate with the mobile units for obtaining and delivering information from and respectively to the mobile units for determining traffic situations in systems in the coverage area. The invention also relates to a method devised for nerwork planning and configuration testing for an RTI system. PRIOR ART American patent specification US 5,126,941 discloses a system for control and guidance of vehicles. The system comprises a central unit with control and storage capabilities and communications units intended to be placed at the edge of the road, for example beacons. The vehicles are provided with equipment for handling guidance and control information from the units. The positions of each beacon are stored in the central memory in the form of two tables with the vertical and, respectively, horizontal coordinates. These coordinates are downloaded to the respective beacon, after which this information can be transferred to passing vehicles. American patent specification US-A-5173710 describing a beacon-based navigation and positoning system shows one way in which a beacon can be made to be not physically present at its geographical position. That way however does not permit bidirectional communication. In European specification 320,913, a method for locating a mobile telephone is described. The fixed base stations send out identity signals and precise time pulses from their fixed locations. Signal transmission is carried out either as a response to an interrogation signal from the mobile or automatically at predetermined time intervals. The mobile unit can utilize internally stored tables of positions of the fixed base stations in calculating its own position. The known method is intended to be used for monitoring and controlling vehicle traffic. The method means that high costs for setting up a new fresh infrastructure for traffic monitoring can be avoided. American patent specification US 5,043,736 discloses a cellular locating system. The system consists of a portable locating unit which can be used both as mobile telephone and for global positioning. The unit has a receiver for receiving signals from a global positioning system and circuits for calculating the position. The position thus obtained is then transmitted to the central unit via a mobile telephone system. In the central unit, there is a capability for correlating the position obtained with a stored digital map for placing the users at their current location on the map. DESCRIPTION OF THE INVENTION TECHNICAL PROBLEM In accordance with the above, it is already known to store positions for fixed stations which are constituted by real beacons. However, it must be possible to carry out a suitable network planning in this type of beacon system. Algorithms for this are poorly developed, which is why one is mainly reduced to using empirical methods. However, errors in these methods can be costly. This is particularly so when one considers that a traditional beacon system, due to its nature, requires relatively many installations. The invention intends to solve this problem, among others. The technical arrangements and costs which are linked to network planning of new communications systems are well known in advance. The- technical problems and costs which can arise due to inadequate or less effective network planning when adding to existing systems are also known. The invention also intends to solve this problem. Today there is a requirement for effectively operating support systems which can be utilized by decision makers at different levels. There is also a need for the arrangement in question to be able to manage gained experience in an effective manner and for the gained experience to be accessible to subsequent decision makers which will utilize the system in question. There is also a need for being able to computerize such a process in an extensive way. The decisions in question should be able to include foundations for the decision, a decision in the form of acceptance and refusal and an electronic signature. Work and research on, among other things, notations for describing activity and support systems therefor have been going on for a number of years at international level. One of the objects is to be able to refine step by step an overall activity description down to an executing support system. It becomes especially urgent to be able to make activity-driven support systems and general support systems which can execute the activity description and in this manner provide support for those who are working in the activity. A central part in the activity description and in the support systems in question is to describe and act the view of the activity towards its user. The invention also intends to solve this problem. SOLUTION The invention provides an arrangement devised for network planning and configuration testing for an RTI system. Such an RTI system is devised to provide short-range communication between mobile units (M1), and vehicles, moving within the coverage area of the system, and beacons (radio beacons). The beacons are arranged to communicate with the mobile units for delivering and obtaining information on traffic within the coverage area. The arrangement is characterised in that virtual beacons are used as beacons, which virtual beacons are represented in a central higher-level unit (MBLT) by stored data on their positions and access telephone numbers. This arrangement provides the possibility of adding, removing or changing virtual beacons in the system by changing said stored data in the higher-level unit (MBLT). This way the invention is adapted to be used for network planning of a beacon system. Different configurations of the beacon placements can be tested in connection with network planning of a beacon system in question. Trials can be started in dependence on the selected configurations and the result of the trial or test can be utilised in network planning for placing real beacons. Road Transport Informatics (RTI) systems using beacons are well known. A review of some of the major characteristics of these systems is discussed in discussed in Proceedings of the Vehicle Navigation and Information Systems Conference, Dearborn, October 20-23, 1991, vol. Part 2, 1 October 1991, Institute of Electrical and Electronics Engineers, pages 923-928, XP000357197; Wall N: "Integrated Communications Architecture for Road Transport Informatics", page 924, section 2.2. In an exchange of a virtual beacon for a real beacon, the said unit (MBLT) is arranged to make possible the execution of downloading to the real beacon which replaces the earlier virtual beacon of data which can be associated with the virtual beacon. The configurations of the beacon placements can be tested in practice with the aid of test runs with vehicles in the system, which is a suitable way especially in a system with little load. Tests can also be carried out with the aid of network and traffic statistics, which is preferably done with high traffic. The invention also relates to a method for network planning and configuration testing for an RTI system, using virtual beacons represented in the higher-level unit (MBLT), which unit is devised for downloading data/information when the virtual beacon is exchanged for a real beacon. ADVANTAGES The invention proposed above provides possibilities for simulating a beacon network by placing out virtual beacons and storing their positions in a memory in a higher-level unit. Such an arrangement and application is superior to earlier network planning methods in which there are difficulties in implementing empirical experience in a cost effective way and in which mistakes can easily be made. DESCRIPTION OF THE FIGURES A presently proposed embodiment of an arrangement which exhibits characteristics significant of the invention will be described below, at the same time referring to the attached drawing in which : Figure 1 shows in a basic diagram form a mobile system for short-range communication and including a virtual beacon connected to a higher-level unit, and Figure 2 shows in a basic diagram form a similar mobile system according to Figure 1 but exhibiting real beacons which are likewise connected to a higher-level unit in the system. DESCRIPTION OF AN EXEMPLARY EMBODIMENT In Figure 1, the coverage system for a short-range communications system, for example the already well known RTI system, is specified by 1. Since the system as such is assumed to be already known, it will not be described here in its configuration or function. The system is provided with a number of beacons which have the form of so-called virtual or apparent beacons (radio beacons) VB in Figure 1. Within the coverage area, mobile units or vehicles M1 are moving. A number of such vehicles are moving within the area and, when passing a respective beacon VB, an information exchange occurs between a respective mobile unit and a respective virtual beacon. The information or data exchanged can thereby be associated with the traffic situation. A respective VB reports, to a respective mobile unit which is passing, on the traffic situation, at least in the closest surrounding area. The mobile unit M1 in turn reports on the traffic situation or road situation on the route which it has last travelled through. A said virtual beacon is represented in a higher-level unit MBLT (Master Beacon Location Table) included in the system. In the said MBLT unit, the virtual beacons are represented through their access telephone numbers and positions. The representation can also include second or alternative information. Figure 2 relates to a corresponding mobile system 1' in which mobile units M1' move in a corresponding manner and real beacons RB are arranged in a manner corresponding to the virtual beacons. The said position information and telephone access numbers are in this case stored in a respective beacon. At a higher level, all beacons within the coverage area can be controlled at least to a certain degree from a higher-level unit E which, however, does not have the same task as the MBLT unit mentioned above. In the system with the said virtual beacons according to Figure 1, changes of the virtual beacons can be carried out in the unit MBLT. Beacons can be added, removed and possibly changed in their function. This changeability in the representation in the MBLT unit is advantageously used in planning beacon-oriented systems. Configurations, one of which is shown in Figure 1, can be introduced in the system and tested in practice, for example due to the fact or with the aid of the fact that vehicles Ml are allowed to move in the coverage area. Such a practical testing can be suitably carried out with low traffic. With high traffic or normal traffic, the planning or fine-tuning can be done with the aid of network traffic statistics. When the planned or configured system proves to be functioning well, the virtual beacons VB can be exchanged for real beacons RB according to Figure 2. The exchange can be carried out in such a manner that all or some of the virtual beacons are replaced by real beacons. A beacon system according to Figure 2 can be fine-tuned by random introduction of virtual beacons and so forth. In this manner, empirical tests can be carried out in a virtual environment which surpasses all forms of simulation and is cost-effective compared with the costs for real empirical tests. On exchange of a virtual beacon VB for a real beacon RB, the unit is intended to download the information to the real beacon RB when the exchange has taken place. The invention can be used in the RTI environment, for example MOBITEX, GSM and so forth (specialized service). The invention is not limited to the embodiment shown above by way of example, but can be subjected to modifications within the scope of the patent claims following

Claims: An arrangement devised for network planning and configuration testing for an RTI system, which system is devised to provide short-range communication and where mobile units (M1) or vehicles are moving within the coverage area (1) of the system, and where beacons, for instance radio beacon, are arranged to communicate with the mobile units for delivering and obtaining information on traffic within the coverage area, the arrangement being characterised by comprising a central higher-level unit (MBLT), in which said beacons are represented by stored data, comprising data on their positions and access telephone numbers, the arrangement providing the possibility of adding, removing or changing beacons by changing said stored data in the higher-level unit (MBLT). Method for network planning and configuration testing for an RTI system, which system is devised to provide short-range communication and where mobile units (Ml) or vehicles are moving within the coverage area (1) of the system, and where beacons, for instance radio beacon, are arranged to communicate with the mobile units for delivering and obtaining information on traffic within the coverage area, the method being characterised in representing said beacons in a central higher-level unit (MBLT) by storing data on said beacons, comprising data on their positions and access telephone numbers, in the higher-level unit (MBLT), providing the possibility of adding, removing or changing beacons by changing said stored data in the higher-level unit (MBLT), thereby providing the possibility of testing a system configuration. The method as recited in claim 2, in which, testing of beacon placements in a system configuration is achieved by test running vehicles in the system, said vehicles communicating with said beacons when passing them.

Inventors: ANDERSSON TORBJOERN, WICHTEL ERIK, ANDERSSON, TORBJOERN, WICHTEL, ERIK, Andersson, Torbjörn
Applicants: TELIA AB
Application year: 1994
Main classification: G08G1
IPC codes: G08G1, H04Q7